/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.metamodel.query.builder;

import java.util.List;

import org.apache.metamodel.query.Query;
import org.apache.metamodel.query.SelectItem;

final class CountSelectBuilderImpl extends SatisfiedSelectBuilderImpl implements
		CountSelectBuilder<GroupedQueryBuilder> {

	private SelectItem selectItem;

	public CountSelectBuilderImpl(Query query, GroupedQueryBuilder queryBuilder) {
		super(queryBuilder);
		this.selectItem = SelectItem.getCountAllItem();
		query.select(selectItem);
	}

	@Override
	public GroupedQueryBuilder as(String alias) {
		if (alias == null) {
			throw new IllegalArgumentException("alias cannot be null");
		}
		selectItem.setAlias(alias);
		return getQueryBuilder();
	}

	@Override
	protected void decorateIdentity(List<Object> identifiers) {
		super.decorateIdentity(identifiers);
		identifiers.add(selectItem);
	}
}